Hub for budget airlines Ryanair, WizzAir and Transavia. Destinations include London Stansted, Dublin and many Mediterranean and Eastern European cities.
The airport is 6km west of town, accessible by buses 400 and 401 each running up to six times an hour from the north side of Eindhoven train station (with/without OV-card €2.50/3.50, 25 minutes).
The first airport-bound buses are at 5.34am and 5.49am on weekdays, generally early enough to catch the first flights. That's not true on weekends with first departures at 8.02/9.02am on Saturday/Sunday.
There are also Airexpress buses from Amsterdam (€22.50, 1¾ hours) via Utrecht (ring-road stop) and Den Bosch (€8.50, 30 minutes) eight times daily from 4.30am. Last return from the airport is 11pm.
Note that the airport closes at night so you can't sleep in the terminal.